Stopper



FIG. 1 is a front elevational view of a stopper showing my new design, the opposite side being a mirror image thereof;

FIG. 2 is a side elevational view, the opposite side being a mirror image thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a sectional view taken along line 5--5 of FIG. 1; and

FIG. 6 is a fragmentary sectional view taken along line 6--6 of FIG. 1. 

The ornamental design for a stopper, substantially as shown and described. 